update invlaidate for cached class method

Author: anthonyp97

cache_helper/decorators.py

@@ -76,9 +76,7 @@ def _cached(func):
         @wraps(func)
         def wrapper(*args, **kwargs):
             # skip the first arg because it will be the class itself
-            function_cache_key = utils.get_function_cache_key(
-                func_name, args[1:], kwargs
-            )
+            function_cache_key = utils.get_function_cache_key(func_name, args[1:], kwargs)
             cache_key = utils.get_hashed_cache_key(function_cache_key)
 
             try:
@@ -115,7 +113,7 @@ def invalidate(*args, **kwargs):
             :param kwargs: The kwargs passed into the original function.
             :rtype: None
             """
-            function_cache_key = utils.get_function_cache_key(func_name, args, kwargs)
+            function_cache_key = utils.get_function_cache_key(func_name, args[1:], kwargs)
             cache_key = utils.get_hashed_cache_key(function_cache_key)
             cache.delete(cache_key)